[Contextual Search] Add Mojo-enabled API component.

chrome/browser/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 95 matching lines @@
     "//components/browser_sync/browser",
     "//components/browser_sync/common",
     "//components/captive_portal",
     "//components/certificate_reporting",
     "//components/cloud_devices/common",
     "//components/component_updater",
     "//components/compression",
     "//components/content_settings/content/common",
     "//components/content_settings/core/browser",
     "//components/content_settings/core/common",
+    "//components/contextual_search",
     "//components/cookie_config",
     "//components/crx_file",
     "//components/data_reduction_proxy/core/browser",
     "//components/data_usage/core",
     "//components/data_use_measurement/core",
     "//components/device_event_log",
     "//components/domain_reliability",
     "//components/enhanced_bookmarks",
     "//components/favicon/core",
     "//components/favicon_base",
@@ skipping 1139 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }